https://gist.github.com/TheNimbleNinja/3fedcf25ae449871d34425811d3398ee

I added a non-null check to my code. However, this seems to be an issue on someone else's side, the spawn reason should never be null. Try and look around the issue tracker's of your entity-adding mods

i have no idea wat causeed the crash it pointed to your mod thats why its here

im seeing it mention lava monster in the log